The rulings people actually argue about, answered from the official rules — with links to the deep-dives where the details live.
Not officially. You draw two cards and lose your turn — no passing it on. Stacking is a hugely popular house rule, so agree on it before the game starts.
No. You may only play it when you hold no card matching the current colour. If you suspect someone broke that rule, you can challenge: a guilty player draws four; a wrong accusation costs you six.
If you’re caught with one card before the next player takes their turn, you draw two cards. Caught later? Too late — no penalty. (Older rule sheets printed a four-card penalty; the current official sheet says two.)
Yes. Going out on a Draw Two or Wild Draw Four is legal and its effect still hits the next player — they draw the cards, and those cards count into the score.
Officially you draw exactly one card; if it’s playable you may play it immediately, otherwise your turn ends. “Draw until you can play” is a house rule.
Reversed: you may draw even though you could play — that’s allowed and sometimes smart. What you can’t do is play more than one card per turn (outside Jump-In tables).
Set the top discard aside, shuffle the rest of the discard pile, and flip it over as the new draw pile. Play continues seamlessly.
Yes — both effectively give you another turn, and Draw Two does as well. The three official changes are on the two-player page.
Not if the table agreed to it — it’s a beloved house rule (and an official toggle in the UNO video games): play an identical card out of turn and the game continues from you. Without that agreement, wait your turn.
Seven each, from a 108-card deck, for 2–10 players. The full setup steps take about a minute.
Decks sold since 2018 add a Wild Shuffle Hands card and three blank Wild Customizable cards to the classic 108. All four are optional extras worth 40 points each — the modern extras, explained.